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Hm, very different and very opposite result, interesting. Are you using the same S2 diaphragm as I do – the metal suspension? If yes then it would be the only one explanation that I might come up with.

Sometime the compression drivers with horn form a very subtle and very bizarre combination when the horn’s throat reactance damps the cone (along with it it’s back chamber) but not juts damps but does it in hipper critical mode when any minute deviation of the loading (like changing the bag-screens density) immediately threw the cone’s damping in one or another extremes. I personally never had it in such a sever care as I have it now but I heard that it might happen and to be VERY notable.

Vitavox did in 180Hz, 220Hz, 300Hz and 330Hz horns, all exponential. We know how S2 behaves in 330Hz – it was made for S2 driver. Interesting that neither Vitavox not any another company that I might recall as not ever did 250Hz hors. Altec did 329A and 311 horns that were 220Hz. The JBL did the same: 220Hz and 300Hz – never 250Hz, at least that I know off. Sure it would not indicate anything, as the balance between the specific driver and the horn size (mass if air in the horn’s belly) is the key. Still, it is juts data…

So, I might presume that at 250Hz and the metal suspended S2 I accidentally hit the “G-spot” of the horn-driver tandem, I am sure that if I measure the driver’s impedance then it will jump like a rollercoaster. Continuing the hypnotizing…. When you went for 180Hz horn you with air in that horn was way beyond the “dangers air-mass” and therefore you did not experience problems. If my hypnotizes is true then I might cure what I have by changing the pressure from back or the front of the cone and then trying to load the driver lower, to see it is will be able to handle it. In fact the leaking of the back chamber is one of those attempts … The sonic differences that I getting is not minor and very easily auditable….

I think if my hypnotize is true then that accidental hyper-fragile equidistant between the cone’ back damping, specific horn size and throat resistance deserved to be named. I propose to call it the “Horn’s Bermuda Triangle”….

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